GarrettCom Magnum 10KG Installation And User Manual page 49

Magnum 10KG Managed Switch Installation and User Guide
A2.0 Applications FOR DC POWERED Ethernet Switches
Magnum 10KG Switches are easily installed in a variety of applications where
24/48VDC and 90-250VDC power is used as the primary power source. The DC power
configuration capability provides an Ethernet networking solution utilizing a special
power supply in switches with a proven track record.
The 48VDC solution is particularly useful in the telecommunication industry,
where it is common for facilities to operate on 48V DC power. Such companies include
regular and wireless telephone service providers, Internet Service Providers (ISPs) and
other communication companies. In addition, many high availability equipment services,
such as broadcasters, publishers, newspaper operations, brokerage firms and other
facilities often use a battery backup system to maintain operations in the event of a power
failure. It is also frequently used for computer system backup, management and
operations monitoring equipment.
The 24V and 90-250VDC options are particularly useful in the industrial
environment, where it is common for facilities to operate on 24VDC or 125VDC power.
(The 125VDC capability is achieved by purchasing a 10KG single-power-supply AC/DC
model, and then using only 125VDC power input.) The 125VDC options are mainly
used in power utilities, such as electrical substations, electrical generating plants, etc. The
24VDC applications are mainly in heavy duty industrial automation such as factory floor,
mining, process control plants, HVAC, COTS military equipment, etc.
A3.0 10KG, 24/48VDC, 90-250VDC INSTALLATION
This section describes the proper connection of the 24/48VDC, leads to the DC
power terminal block on the Magnum 10KG Switch. The DC terminal block on the
Magnum 10KG Managed Switch is located on the right rear or left front (Reverse unit) of
the unit and is equipped with four (6) screw-down lead posts. The power terminals are
identified as positive (+/L) and negative (-/N), and they are electrically floating inside the
unit so that either may be grounded by the user if desired. The chassis is "earth" or
ground (GND).
The connection procedure is straightforward. Simply insert the DC leads to the
Switch's power terminals, positive (+/L) and negative (-/N) screws. The use of Ground
(GND) connects to the Switch chassis screw provided under the DC terminal. Ensure that
each lead is securely tightened.
Note: The GND should be hooked up first. The 10KG unit has a floating ground, so
the user may elect to Ground either + or - terminal to suit the customer's use. Before
connecting live power lines to the terminal block, always use a digital voltmeter to
measure the output voltage of the power supply and determine the lead which is more
"+ve potential". The more "+ve" voltage lead from a +ve or –ve power supply must be
connected to the post labeled "+".
When power is applied, the green PWR LED will illuminate.
Note: The 10KG unit has a floating ground, so the user may elect to Ground either +
or - terminal to suit the customer's use.
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